[SystemZ]  Fix commit message of previous commit.

Sorry, the commit comment for r332703 is completely broken.
My mind slipped - the right description would be:

In SystemZDAGToDAGISel::Select(), in the handling for SELECT_CCMASK:

Check if UpdateNodeOperands() returns a different SDNode and in that
case call ReplaceNode.

Review: Ulrich Weigand.
llvm-svn: 332706
diff --git a/llvm/lib/Target/SystemZ/SystemZISelDAGToDAG.cpp b/llvm/lib/Target/SystemZ/SystemZISelDAGToDAG.cpp
index e65abc4..5425f1d 100644
--- a/llvm/lib/Target/SystemZ/SystemZISelDAGToDAG.cpp
+++ b/llvm/lib/Target/SystemZ/SystemZISelDAGToDAG.cpp
@@ -1512,7 +1512,7 @@
       SDNode *UpdatedNode =
         CurDAG->UpdateNodeOperands(Node, Op1, Op0, CCValid, CCMask, Op4);
       if (UpdatedNode != Node) {
-        // In case this node already exists, replace Node with it.
+        // In case this node already exists then replace Node with it.
         ReplaceNode(Node, UpdatedNode);
         Node = UpdatedNode;
       }